Principles of Economics
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1 Principles of Economics LEARNING OBJECTIVES Ohio Wesleyan University Goran Skosples 3. Interdependence and the Gains from Trade Why do people and nations choose to be economically interdependent? How can trade make everyone better off? What is absolute advantage? What is comparative advantage? How are these concepts similar? How are they different? 1 Interdependence Every day you rely on many people from around the world, most of whom you do not know, to provide you with the goods and services you enjoy. hair gel from Cleveland, OH cell phone from Taiwan dress shirt from China coffee from Kenya Our Example Two countries: the U.S. and Japan Two goods: computers and wheat One resource: labor, measured in hours We will look at how much of both goods each country produces and consumes if the country chooses to be self-sufficient if it trades with the other country Trade can make everyone better off. 2 3
2 Production Possibilities in the U.S. The U.S. has 5, hours of labor available for production, per month. Producing one computer requires 1 hours of labor. Producing one ton of wheat requires 1 hours of labor. 5, 4, 3, 2, 1, The U.S. PPF The U.S. has enough labor to produce 5 computers, or 5 tons of wheat, or any combination along the PPF , 4, 3, 2, 1, The U.S. Without Trade 1 Suppose the U.S. uses half its labor to produce each of the two goods. Then it will produce and consume computers and tons of wheat A C T I V E L E A R N I N G 1: Derive Japan s PPF Use the following information to draw Japan s PPF. Japan has 3, hours of labor available for production, per month. Producing one computer requires 125 hours of labor. Producing one ton of wheat requires 25 hours of labor. Your graph should measure computers on the horizontal axis. 6 7
3 Japan s PPF Japan Without Trade 2, 1, Japan has enough labor to produce computers, or tons of wheat, or any combination along the PPF. 2, 1, Suppose Japan uses half its labor to produce each of the two goods. Then it will produce and consume 12 computers and 6 tons of wheat Consumption With and Without Trade Without trade, U.S. consumers get 25 computers and 25 tons wheat. Japanese consumers get 12 computers and 6 tons wheat. We will compare consumption without trade to consumption with trade. First, we need to see how much of each good is produced and traded by the two countries. A C T I V E L E A R N I N G 2: Production under trade 1. Suppose the U.S. produces 34 tons of wheat. How many computers would the U.S. be able to produce with its remaining labor? Draw the point representing this combination of computers and wheat on the U.S. PPF. 2. Suppose Japan produces 24 computers. How many tons of wheat would Japan be able to produce with its remaining labor? Draw this point on Japan s PPF. 1 11
4 5, 4, 3, 2, 1, U.S. Production With Trade Producing 34 tons of wheat requires labor hours. The remaining labor hours are used to produce computers. 2, 1, Japan s Production With Trade Producing 24 computers requires all of Japan s labor hours. So, Japan would produce tons of wheat International Trade Exports: goods produced domestically and sold abroad Imports: goods produced abroad and sold domestically A C T I V E L E A R N I N G 3: Consumption under trade Suppose the U.S. exports 7 tons of wheat to Japan, and imports 11 computers from Japan. (So, Japan imports 7 tons wheat and exports 11 computers.) How much of each good is consumed in the U.S.? Plot this combination on the U.S. PPF. How much of each good is consumed in Japan? Plot this combination on Japan s PPF
5 U.S. Consumption With Trade computers wheat 5, 4, 3, 2, 1, produced imported exported = amount consumed 2, 1, Japan s Consumption With Trade computers wheat produced 24 + imported exported = amount consumed Trade Makes Both Countries Better Off consumption without trade U.S. consumption with trade gains from trade computers wheat 2,5 2,7 2 consumption without trade Japan consumption with trade gains from trade computers wheat Where Do These Gains Come From? Absolute advantage: the ability to produce a good using fewer inputs than another producer The U.S. has an absolute advantage in the production of wheat: producing a ton of wheat uses 1 labor hours in the U.S. vs. 25 in Japan. If each country has an absolute advantage in one good and specializes in that good, then both countries can gain from trade. 19
6 Where Do These Gains Come From? Which country has an absolute advantage in computers? Producing one computer requires 125 labor hours in Japan, but only 1 in the U.S. The U.S. has an absolute advantage in both goods! So why does Japan specialize in computers? Why do both countries gain from trade? Two Measures of the Cost of a Good Two countries can gain from trade when each specializes in the good it produces at lowest cost. Absolute advantage measures the cost of a good in terms of the inputs required to produce it. Recall: Another measure of cost is opportunity cost. In our example, the opportunity cost of a computer is the amount of wheat that could be produced using the labor needed to produce one computer Opportunity Cost and Comparative Advantage Comparative advantage: the ability to produce a good at a lower opportunity cost than another producer Which country has the comparative advantage in computers? To answer this, must determine the opp. cost of a computer in each country. 22 Opportunity Cost and Comparative Advantage The opp. cost of a computer is tons of wheat in the U.S., because producing one computer requires 1 labor hours, which instead could produce 1 tons of wheat. tons of wheat in Japan, because producing one computer requires 125 labor hours, which instead could produce 5 tons of wheat. So, has a comparative advantage in computers. (Absolute advantage is not necessary for comparative advantage!) 23
7 Comparative Advantage and Trade Differences in opportunity cost and comparative advantage create the gains from trade. When each country specializes in the good(s) in which it has a advantage, total production in all countries is higher, the world s economic pie is bigger, and all countries can gain from trade. The same applies to individual producers (like the farmer and the rancher) specializing in different goods and trading with each other. A C T I V E L E A R N I N G 4: Absolute & comparative advantage Argentina and Brazil each have 1, hours of labor per month, and the following technologies: Argentina producing one pound coffee requires 2 hours producing one bottle wine requires 4 hours Brazil producing one pound coffee requires 1 hour producing one bottle wine requires 5 hours Which country has an absolute advantage in the production of coffee? Which country has a comparative advantage in the production of wine? A C T I V E L E A R N I N G 4: Answers has an absolute advantage in coffee: Producing a pound of coffee requires only labor-hour in, but in. has a comparative advantage in wine: s opp. cost of wine is pounds of coffee, because the labor-hours required to produce a bottle of wine could instead produce pounds of coffee. s opp. cost of wine is pounds of coffee. Unanswered Questions. We made a lot of assumptions about the quantities of each good that each country produces, trades, and consumes, and the price at which the countries trade wheat for computers. In the real world, these quantities and prices would be determined by the preferences of consumers and the technology and resources in both countries. We will begin to study this in the next chapter. For now, though, our goal was only to see that trade, indeed, can make everyone better off
8 CHAPTER SUMMARY Interdependence and trade allow everyone to enjoy a greater quantity and variety of goods & services. Comparative advantage means being able to produce a good at a lower opportunity cost. Absolute advantage means being able to produce a good with fewer inputs. When people or countries specialize in the goods in which they have a comparative advantage, the economic pie grows and trade can make everyone better off. 28
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